/*
 * pipe_15_4.c
 *
 *  Created on: 2012-5-3
 *      Author: jawinton
 */

#include "../apue.h"
#include <sys/wait.h>

#define PAGER "${PAGER:-more}"

int main (int argc, char *argv[]) {
	char line[MAXLINE];
	FILE *fpin, *fpout;

	if (argc != 2) err_quit("usage: pipe <pathname>");
	if ((fpin = fopen(argv[1], "r")) == NULL) err_sys("error open %s", argv[1]);
	if ((fpout = popen(PAGER, "w")) == NULL) err_sys("popen error");
	while (fgets(line, MAXLINE, fpin) != NULL) {
		if (fputs(line, fpout) == EOF)
			err_sys("fputs error to pipe");
	}
	if (ferror(fpin)) err_sys("fgets error");
	if (pclose(fpout) == -1) err_sys("pclose error");
	exit(0);
}
